WASHINGTON — Border Patrol officers are working without permission on private property and setting up checkpoints up to 100 miles away from the border under a little-known federal law that is being used more widely in the Trump administration’s aggressive crackdown on illegal immigration.

Spilling out wrenching tales of lost lives and stolen security, students and parents appealed to President Donald Trump on Wednesday to set politics aside and protect America’s school children from the scourge of gun violence. Trump listened intently to the raw emotion and pledged action, including the possibility of arming teachers.

In the era of #MeToo, President Trump’s behavior would be fireable and career-ruining for most CEOs or celebrities, according to experts. But the Republican Party is increasingly invested in his success.